Add Router label to router issue template (#24381)

# Why

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Please describe the motivation for this PR, and link to relevant GitHub
issues, forums posts, or feature requests.
-->

# How

Add Router label to router issue template (#24381)

# Why

<!--
Please describe the motivation for this PR, and link to relevant GitHub
issues, forums posts, or feature requests.
-->

# How

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How did you build this feature or fix this bug and why?
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# Test Plan

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Please describe how you tested this change and how a reviewer could
reproduce your test, especially if this PR does not include automated
tests! If possible, please also provide terminal output and/or
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# Checklist

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Please check the appropriate items below if they apply to your diff.
This is required for changes to Expo modules.
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- [ ] Documentation is up to date to reflect these changes (eg:
https://docs.expo.dev and README.md).
- [ ] Conforms with the [Documentation Writing Style
Guide](https://github.com/expo/expo/blob/main/guides/Expo%20Documentation%20Writing%20Style%20Guide.md)
- [ ] This diff will work correctly for `npx expo prebuild` & EAS Build
(eg: updated a module plugin).

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Create issue template for Expo Router (#24187)

# Why

- Part of migrating `expo-router` from https://github.com/expo/router to
this repo.
- Too many low-quality, unrelated, non-reproducible, and

Create issue template for Expo Router (#24187)

# Why

- Part of migrating `expo-router` from https://github.com/expo/router to
this repo.
- Too many low-quality, unrelated, non-reproducible, and duplicate
issues on the `expo-router` repo. The additional criteria will help us
move faster.

# How

- Copy the Expo SDK issue template and add fields for selecting the
package manager and bundler (this helps prevent users from opening
issues regarding webpack).

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[.github] Remove forums link from issue template